Lithium battery custom:
In this era of new energy prevalence, phosphoric lithium batteries are widely used in electric cars, energy storage equipment and so on because of their high safety and long life. However, as the time of use increases, battery performance decreases, and repairing batteries becomes a concern for many. Today, let's go into the restoration of the phosphate lithium batteries。
Reasons for reduced performance of lithium phosphate batteries
Before exploring repair methods, it is important to understand why the performance of the lithium phosphate batteries is decreasing. On the one hand, the electrode material within the battery is subject to structural changes during charging. For example, long-term charging can cause micro-modes in the crystals of the phosphate lithium orthotic material, making it difficult to embed and remove lithium ions, and thus reduce battery capacity. On the other hand, electrolytic fluids gradually decompose and form passivated membranes on the surface of the electrode, which hinder ion transfer and thus affect battery performance. Also, external factors such as overcharge, over-discharge and high-temperature environments can accelerate battery ageing。
Common restoration methods
Equal charge method
Rationale: lithium phosphate batteries typically consist of multiple monomer batteries, whose capacity, internal resistance, etc. May vary depending on, inter alia, the manufacturing process. As the number of recharge cycles increases, the difference accumulates, resulting in overcharging or overloading of some batteries, affecting the performance of the battery as a whole. Balancing charge is to eliminate this difference by enabling single-body batteries to be charged in the same state through special chargers。
Operational steps: first, specialized batteries need to be used to balance chargers. The battery is properly connected to the charger, and the charger's instructions set the charger parameters, which typically include battery voltage, capacity, etc. The charger is then activated and the charger is balanced. This process may take a long time to wait patiently until the charger shows that the individual batteries of the battery are balanced。
Depth charge method
Principle: a deep charge can activate some of the “sleeping” active substances inside the battery and improve battery recharge performance. The long-term use of lithium phosphate batteries reduces the activity of some active substances and the deep charge allows them to re-engage in electrochemical reactions。
Operational step: the battery is discharged in depth until the battery voltage reaches its cut-off. However, it should be noted that deep discharges cannot be excessive or cause irreversible damage to batteries. The battery is then fully charged with the appropriate charger, which is performed with close attention to temperature and voltage changes in the battery to ensure that the recharge process is safe. Several deep recharge cycles can be repeated to obtain better restoration。
Pulse repair
Rationale: pulse repair is the use of instant high voltage pulses to crush the sulphide crystals on the cell poles (for lithium phosphate batteries, mainly removing barriers such as blunt membranes from the electrode surface) and to restore the activity of the battery panels. This high-voltage pulse can break down the adverse material formed on the surface of the electrodes and make the ion transfer smoother。
Operational steps: special pulse repair equipment needs to be purchased. The pulse repair equipment is properly connected to the battery, setting pulse parameters such as pulse width, pulse frequency, etc. In general, pulse width ranges from microseconds to milliseconds, and pulse frequency ranges from dozens to thousands of hertz. After setting the parameters, the pulse repair equipment was activated and the batteries repaired. The recovery time may take hours or even days depending on the age of the battery。
Attention
Safety first: be safe when performing battery repair operations. Although relatively safe, the lithium phosphate batteries may still be exposed to leaks, fires, etc. During repair. Protective equipment, such as gloves and goggles, should be worn and operated in a well-ventilated environment。
Professional tools: use, to the extent possible, specialized battery detection and repair tools to avoid the use of equipment that is not matching or of poor quality, thus causing further damage to batteries。
Data recording: before and after the restoration, the battery's electrical voltage, capacity, internal resistance, etc. Are measured and recorded in order to assess the restoration effect。
The restoration of lithium phosphate batteries can restore its performance to some extent and extend its useful life. The balancing charge method, the depth charge method and the pulse repair method have characteristics and applicable scenarios. In practice, appropriate repair methods are selected according to the specific circumstances of the battery, and the operational specifications and care are strictly followed. It is hoped that through these methods, you will be able to “rejuvenate” your own lithium phosphate batteries. If there is any doubt in the course of the restoration, a message can also be exchanged in the comment area at any time。
Ron caveway
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